Finding the Fourth Proportional to 42,386.16, 63,589.47 and 12,802.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,386.16 : 63,589.47 = 12,802.20 : x
2. Step 2: Convert to fraction form
   42,386.16/63,589.47 = 12,802.20/x
3. Step 3: Cross multiply
   42,386.16x = 63,589.47 × 12,802.20
4. Step 4: Simplify right side
   42,386.16x = 814,085,112.83
5. Step 5: Solve for x
   x = 814,085,112.83/42,386.16
6. Step 6: Final answer
   x = 19,206.39